Photographic plate holder



(No Model.) 2' sheets-sheet 1. J. STOCK. PHOTGGRAPHIG PLATE HOLDER.

Patented July so, 1895.

| [Tllllrllllllillll QN@ Model.) `:a sneens-sheet 2. J. STOCK.PHOTOGRAPHIG PLATE HOLDER.

No. 543,585, Patented July 30, ,1895.

UNITED STATES JOHN STOCK, or

PATENT OFFICE.

Nnw YORK, N. Y.

PHoroGRAPHlo-PLATE HOLDER.

SPECIFICATION forming part of Letters Patent No. 543,585, dated J' uly30, 1895.

Application led April 30, 1895.

To a/ZZ whom it may concern:

Be it known that I, JOHN STOCK, a citizen of the United States, and aresident of New York, in the county of New York and State of New York,have invented certain new and useful Improvements in Photographic-PlateHolders,of which the following is a specification.

This invention relates to Various improvements in photographicplateholders, and more particularly to a novel construction of thescreen-frame, shutters, and the slide for holding the sensitized plate.

Inthe accompanying drawings, Figure 1 is a face view of my improvedplate-holder with the front shutter drawn out and the rear shutterpartly broken away; Fig. 2, an end View of Fig. 1; Fig. 3,.a horizontalsection on line 3 3, Fig. 1; Fig. 4, a rear view of the plateholder withthe door removed; Fig. 5, a side View of the upper' slide for holdingthe sensitized plate; Fig. 6, a section on line 6 6, Fig. 5; Fig. 7, atop view of the lower slide; Fig. 8, an enlarged section on line 8 8,Fig. 7; Fig. 9, a section on line 9 9, Fig'. 2. Figs. 10, 11, and 12 arecross-sections on line 10 10, Fig. 9, showing the screen in differentpositions; Fig. 13, an enlarged detail of the side-locking mechanism ofthe screen; Fig. 14, a cross-section on line 14 14, Fig. 13; Fig. 15, aplan of the top-locking mechanism ofthe screen; Fig. 16,'a section online 1G 16, Fig. 15; Fig. 17, a side View of the copy-frame; Fig.18, asection on line 1S 1S, Fig. 17'; and Fig. 19, a'section on line 19 19,Fig. 18.

The lettera-represents the frame of the plate-holder adapted for thereception of a front shutter h, a rear -shutter c, a screenframe CZ, anda sensitized plate e, placed back Ot` one another. The plate c is heldin place by an upper slide e and a lower slide e2, Figs. 4 to S,vertically movable within a groove of the frame d. The upper slide isprovided with the'lugs e3, against which the plate c is pressed by aspring f', secured to the vrear doorfof the plate-holder. The lowerslide e2 is provided with lugs e4, adapted to engage grooves d of frameo, Fig. 4, so as to hold the slide at different vertical positions. Thislower slide is, moreover, provided with a perforated trough or silversalver to catch the drippings, and with a pair of bridges enpon rack du.

serai No. 547134. (No model.)

which the sensitized plate rests. Inwardlyturned nicks e6 on the frontwallet' the trough hold the sensitized plate at a distance from suchwall and prevent moisture from creeping up the plate by capillaryaction.

The framed is of asize to encircle the frame d', containing the'screend2.

the distance between screen d2 and sensitized plate e may be readilyvaried by mechanism secu-red tO the outside of the plate-holder. InFigs. 11 and 12 the extreme positions and in Fig. 10 one ot' Atheintermediate positions of the screen are shown. The object of thisadjustment is,'of course, to harden or soften the lines of the picture.In order to effect this adjustment of the frame d, it is provided at thecenter of its upright sides with laterallyextending arms d5 that passoutward'lythrough slots in the side of the plate-holder d, Fig. 9. Thesearms are connected to spring catches or levers d6, Fig. 2, pivoted tothe'plate-holder and havingteeth dl adapted to engage ixed racks d8. Itwill be seen that by vibrating the levers d6 and causing themtokinterlock with either of the teeth ofthe racks (Z8 the frame d may bereadily set and locked at the desired distance lfrom the sensitizedplate e. In order to also lock the frame d at the top of theplate-holder between its extreme portions, Fig. 10, and prevent it fromtilting, it is provided at the center of its upper side with au arm di),Figs. l5 and 16, connected to lever d10, having tooth d and adapted toengage the To set the frame d the side levers d6 are Iii-st manipulated,and after the frame has been 'properly set by them it is righted Theframe olis held to the frame d by means of springs d3,

and locked in position at the top by the lelOO in line with either oneof the four corners of the sensitized plate, and thus light may beadmitted consecutively to the four corners of such plate. By the use ofthe tWo shutters four (more orless) exposures can bemade upon the sameplate Without removing the plate, however, from the camera.

In use, the inner shutter is closed, the outer shutter is set, and thenthe inner shutter is opened to effect the exposure. After the firstexposure the inner shutter is closed, the outer shutter is reversed tobring the opening b into a new position, and then the second exposure ismade. In this Way the four exposures are made in rapid succession andthen the plate-holder is removed and conveyed to the dark-room Where allfourobjects are developed at the same time, thus finishing four picturesin the time and with the same amount of material as is ordinarily usedon a single negative.

IE the object to be copied or reduced is a picture, photograph, artistsdrawing, dsc., itis mounted upon the copy-traine illustrated in Figs. 17to 19. This frame gis provided with an intermediate sliding frame g',made ot one-half the size of the main frame g. Vithin the intermediateframe g slides a third or inner frame g2, made of one-half the size ofthe frame g and adapted to hold the picture g3. By moving the frame gfup or down and moving the frame g2 to the right or left, the picture g3can be placed into any one of the four corners ot the frame g. In thisway the picture can be set in harmony with the slide' b, so as to be inline with the opening b of such slide.

Vhat I claim isl. A' photographic plate holder provided With an outershutter having an opening, an inner imperforate shutter, an adjustablescreen and a pair of slides for holding the sensitized plate,substantially as specified.

2. A photographic plate holder provided with a movable screen-holdingframe, out- Wardly extending arms secu red to such frame and a lockingdevice at the outside of the plate holder which is connected to sucharms and is adapted to lock the frame in ditlerent positions,substantially as specified.

3. A photographic plate holder provided With a movable screen-holdingframe, outwardly extending arms secured to such frame, levers pivoted tothe plate holder and connected to the arms and racks engagetl by thelevers, substantially as specified.

Signed at New York, in the county of New York and State of New York,this 27th day of April, A. D. 1895.

JOHN s'rocli.i

Vitnesses: I

F. v. BRIESEN, WILLIAM SCHULZ.

